The flagellum of antenna of cockroach is

Options

A. 11 jointed
B. 13 jointed
C. unjointed
D. many jointed

Answer

To answer the question "The flagellum of antenna of cockroach is:", we need to analyze the structure of the antenna in cockroaches.

### Step-by-Step Solution:

1. **Understanding the Structure of Cockroach Antenna**:
- The antennae of a cockroach are sensory organs that are divided into segments. They play a crucial role in sensing the environment, including taste, smell, heat, humidity, and touch.

2. **Identifying the Parts of the Antenna**:
- The antenna consists of three main parts: the scape (the basal segment), the pedicel (the second segment), and the flagellum (the distal part).

3. **Counting the Segments**:
- The flagellum is made up of several smaller segments. In the case of the cockroach, the flagellum is composed of multiple joints.

4. **Evaluating the Options**:
- The options provided are:
- A) 11 jointed
- B) 13 jointed
- C) Unjointed
- D) Many jointed
- Based on the anatomy of the cockroach antenna, the flagellum is not limited to a specific number of joints like 11 or 13, nor is it unjointed. It is composed of many joints.

5. **Conclusion**:
- Therefore, the correct answer is that the flagellum of the antenna of a cockroach is **many jointed** (Option D).